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Space History Photo: Assembling Structures in the Payload Bay

space history, nasa, eva
Astronauts build the ASEM structure during the fourth EVA of the STS-49 mission in 1992. (Image credit: NASA.)

In this historical photo from the U.S. space agency, STS-49 Mission Specialist (MS) Kathryn C. Thornton (foreground) releases a strut from the Multipurpose Experiment Support Structure (MPESS) strut dispenser during Assembly of Station by Extravehicular Activity Methods (ASEM) procedures in Endeavour's payload bay. MS Thomas D. Akers, positioned on the opposite side of the MPESS, waits for Thornton to hand him the final strut.

The two astronauts are building the ASEM structure during the mission's fourth EVA. The ASEM structure, locked in at four corners to payload retention latch assemblies (PRLAs), rises above the payload bay. In the background are the Intelsat cradle, the vertical tail, and the orbital maneuvering system (OMS) pods. The pale blue and white Earth is visible below.

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The National Aeronautics and Space Administration (NASA) is the U.S. government agency in charge of the civilian space program as well as aeronautics and aerospace research. Founded in 1958, NASA is a civilian space agency aimed at exploring the universe with space telescopes,  satellites, robotic spacecraft, astronauts and more. The space agency has 10 major centers based across the U.S. and launches robotic and crewed missions from the Kennedy Space Center in Cape Canaveral Florida. It's astronaut corps is based at the Johnson Space Center in Houston. To follow NASA's latest mission, follow the space agency on Twitter or any other social channel, of visit: